Triathlon Regimen logoTriathlon RegimenScience-backed tools for triathletes
CalculatorsGuides
/
Open Race Calculator
/
Guides LibraryTriathlonSwimBikeRun
CalculatorsGuidesOpen Race Calculator
Quick Help
Editorial TeamContact

Triathlon Regimen

Built for triathletes who want better decisions, not more noise.

Free race calculators, benchmark data, and training metrics for every triathlon distance from Super Sprint to Ironman.

Explore

  • Triathlon
  • Swim
  • Bike
  • Run
  • Guides

Our Platforms

  • Triathlon Regimen
  • Cycling Regimen
  • Run Regimen
  • Swimming Regimen
  • Rowing Regimen

Trust

  • Editorial Team
  • Editorial Standards
  • About
  • Contact
  • Privacy
  • Terms

© 2026 Triathlon Regimen. Science-backed tools for triathletes.

Privacy-first. No ads, no account required.

  1. Home
  2. /Calculators
  3. /Bike
  4. /Bike Split
Last reviewed: May 2, 2026Reviewed by: Manish Rajput

FAQ

Frequently asked questions

What percentage of FTP should I ride in a triathlon?

Sprint: 90-100%, Olympic: 85-92%, 70.3: 75-82%, Ironman: 68-75%. These ranges protect your run while maintaining competitive bike splits.

Should I ride even power or even speed?

Even effort (power) is more efficient than even speed on variable terrain. Push slightly harder on uphills and ease off on descents to minimize time lost while managing fatigue.

How often should I eat on the bike?

Every 15-20 minutes for long-course racing (70.3 and Ironman). Target 60-90g carbs per hour. Set a timer or use course landmarks as nutrition reminders.

Evidence

References

  • Validation of a mathematical model for road cycling power

    Journal of Applied Biomechanics

  • Pacing strategy and cycling performance

    Sports Medicine

This calculator provides estimates based on published exercise science research. Individual responses vary. These outputs are not a substitute for coaching, medical clearance, or your own experience. Always listen to your body and consult a qualified professional before making significant changes to your training.

Related calculators

Keep the next decision close.

FTP Calculator

Bike

Estimate functional threshold power and turn it into cleaner bike zones, Sweet Spot targets, and triathlon pacing anchors.

Bike TSS Calculator

Bike

Calculate bike Training Stress Score, Intensity Factor, and target ride stress with cleaner load guidance for self-coached triathletes.

Cycling Power Zone Calculator

Bike

Enter your FTP to see all 7 Coggan power zones with watt ranges, training purpose, example workouts, and triathlon pacing context.

Bike

Bike Split Calculator

Plan your triathlon bike splits using power-based pacing. Get per-segment time estimates, nutrition timing, and TSS projections.

Race Setup

Total Time

3h 05m

Avg Speed

29.2 km/h

Target Power

172W

IF: 0.78

Estimated TSS

188

NP: ~182W

Segment Breakdown

#DistanceGradePowerSpeedTimeNotes
110.0 km+2%172W22.8 km/h26.3 minTake nutrition
210.0 km-1%172W38.5 km/h15.6 minTake nutrition
310.0 km+0.5%172W30.3 km/h19.8 minTake nutrition
410.0 km+2%172W22.8 km/h26.3 minTake nutrition
510.0 km-1%172W38.5 km/h15.6 minTake nutrition
610.0 km+0.5%172W30.3 km/h19.8 minTake nutrition
710.0 km+2%172W22.8 km/h26.3 minTake nutrition
810.0 km-1%172W38.5 km/h15.6 minTake nutrition
910.0 km+0.5%172W30.3 km/h19.8 minTake nutrition

Nutrition Timing

20minElectrolyte drink sip (200ml)
40minGel or solid + electrolyte drink
60minElectrolyte drink sip (200ml)
80minGel or solid + electrolyte drink
100minElectrolyte drink sip (200ml)
120minGel or solid + electrolyte drink
140minElectrolyte drink sip (200ml)
160minGel or solid + electrolyte drink
180minElectrolyte drink sip (200ml)

Pacing Recommendations

  • For rides over 2.5 hours, target 60-90g of carbs per hour and 500-800ml of fluid per hour.